Measuring instrument.



W. J. MUNGASTER. MEASURING INSTRUMENT. APPLICATION FILED 00'1.2H, 1912.

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W. J- MUNUASTER. MEASURING INSTRUMENT. APPLICATION FILED 001128, 1912. k 1 $60, 1 1 1 Patented Apr. 29, 1913.

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W. J. MUNGASTER. MEASURING INSTRUMENT. APPLIUATION FILED 0GT.ZB. 1912.

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.To all whom-it may concern "em, a citizen of the United States, residing --at Cumberlandyin the county ofJA-ll'egany and State of Maryland,-have invented certainnewand usfulImprovements in'Measuring Instruments, of which the following is'a specification. E D

This invention. relates -to measuring 1nl'o strumlcnts and provides a direct reading -micrometer caliper of the'pivoted leg type adapted for the measurement of a relatively "wide range of diameters.

The particulariieId oft-he deviee is the V l5nieasurement of sei'iesof objects intended all to be of'a standard size-to determine kieviations above andbelow standard. For

20 as-iil-ustrated'herein isintendedito measure deviations of fourteen one-thousandths of an inch (01014 in.) above and below standard. In using my calipers'theproce'dure is first to adjust the length ofthe caliper legs-to correspond withft-he diameter'to be'measured, andth enset the calipers'to a zero ;'reading on a standard-gage.

'1 illustrate preferred; embodiments of the inventionin' the accom ying drawings, in -'which:" d I 1 'Fignrell is a front elevation of a pair of out-side caligers embodying 'my inyention;

Fig. '2' isa si e elevationyofi the sarneiiFig. 3 -is a rear elevation oft-he same;'F1g. 4 is an are respectively front and side elevations of an inside caliper embodying-my invention.

Theindicatin-g mechanism'of the call er is carried'on a supporting plate-1, provi ed,-

with an externally threaded flange 2 on its" short end of lever 10. The lever 10 ispit'ie oted at 11 and its long arm is connected by a link 12 to a gear segment 13 pivoted'lat 14, and meshing with a inion The pinion-5 15 is fast on the she t 16 FfiIfiCh carries the elevation with the rear cover plate removed, Fig.5 is a section on the line 5- 5 of Fig. 3;- "Fig; 6 is a section-of the rejarcover -p'late on "the line 66 of Fig, 3; and-Figs. 7 and .8

frontfac'e and an internally threadedl'flange" .IliEASURING ntsmumnm.

Specification bi! Letters Patent. 7 Patented 29,1913. .Appucmiommea'octbber as, 1912: "Seria1'ito.'728,167.

nected to sha'ft16. and a stud-'19 urges-the leg 7toward its companion leg 20; Inthe case of inside calipers the action of-spring 18 isrof course reversed. The motion of leg-7'is'restricted' bylimit stops 21 and 22 'to'the desiredzrange, inthis case 0.028 in. The leg 20 is made integral with back cover plate"23 which turnson the outer surface -o f-'fiange3. It'ma be clamped in any de- -sired-aligularrelatlon with leg 'f'by means of wing; nuts' 24 on studs 25, these studs? be- 'ing carried by string 26 in threaded en- Graduations are marked on the edge of merit.

inEigs. 1%, each of the caliper legs 7 and "'20 ternnnates in an are shaped guide] 27 in nuts'30. ..'A suitable index is marked on the leg'to coact with the graduations in the "extension. One extension 28 carries-a fixed cont-act point 31. andjthe other a threaded adjustable contact,point 32 which maybe locked by a set-screw 33. The graduations in the leg extensions correspond to diameters for which the calipergmay' be seti and these stant" the altitude of a triangle; whose' base is the 2 line between, the contact points and whose apex is pivot' 8. This givesjan apr-proximate correction; for, the varyin'giangw 'larity" of the legs with different diameters. "The; purpose ininsingthe curved guides and cont-act; points substantially normal to surff'ac'es to be measured in the various adjustigj'mentsof the'caliper. n

" "In .the-cas'ejof' he inside= calipersshown straight extensionsB and 35 which are adl jus'table longitudinally on said legs and may be accurately set' by means "of gradua; :tion's' marked on them as shown. Clamp 'nuts24c hold-thef'extensions. One extension 35 has a: fixed contact point 36 and the other has a pivoted ,contact jpoint 37 adjustable by means of. the screws '38.

The method of setting the two types of caliper are substantially identical and will In the case of outside calipers as shown" extensionjsiis to pre'serve the} axes ofjthe indicating harid'17. A hair spring l icon- I gagement with theinner'face of flange V "platel and an index-mark is, placed in back 23 as shown in Fig. 2 to aidin thisIadjust-j which is slidably-mounted, a curved extene f slon 28 graduated as shown and held in ad f usted position by a clamp loop 29-, and wing ,graduations are such asto maintain conbe set forth with reference to the outside type. Assume that it is intended to caliper 3 inch diameters. Loosen nuts 25, turn the back plate 23 until its index reads 3 in the graduations marked on the edge of plate 1, and clamp the back plate. Adjust. the extensions 28 with the 3 graduations at the index on the legs. Loosen clamp 33, screw point 32 back and apply the calipers to a standard gage. Then screw point 32 forward until hand 17 points to zero. Set up clamp 33 and the calipersare ready for use.

Having thus described my invention, what I claim is a 1. The combination of a supporting plate; a caliper leg mounted thereon; means for angularly adjusting said leg with reference to said plate; a second caliper leg pivoted on said plate and capable of a limited angular movement relatively thereto; a multiplying indicating device connected with said plate and said second leg to indicate the relative movements thereof; longitudinally adjust-able extensions mounted on each of said legs, and provided with contact points; and means for fastening said extensions in adjusted positions.

2. The combination of a supporting plate; a caliper leg mounted thereon; means for angularly adjusting said leg with reference to said plate; a second caliper leg pivoted on said plate and capable of a limited angular movement relatively thereto; a. multiplying indicating device connected with said plate and said second leg to indicate the relative movements thereof; longitudinally .adjustable curved extensions mounted on each of said legs, and provided with contact points; and means for fastening said extensions in adjusted positions.

3. The combination of a supporting plate; a caliper leg mounted thereon; means for angularly adjusting said leg with reference to said plate; a second caliper leg pivot-ed on said plate and capable of a limited angular movement relatively thereto; a multiplyin'g indicating device connected with said plate and said second le to indicate the relat-ive movements thereof; longitudinally adjustable extensions mounted on each of said legs; means for fastening said extensions in ad usted pos1t1ons;. and contact polnts on said extensions,-one of said points being adjustable on its extension toward the other.

4:. The combination of a supporting plate;

a caliper-leg mounted thereon and having a on said plate and capable of a limited B'EST AVAILAELE COPY LiDbQIM curved guideway; means for angularly ad justing said leg with reference to said plate; a second caliper-leg pivoted on said plate, capable of a limited angular mov ment rela- 5c tively thereto and having curved guide way; an indicating device connected with said plate and said second leg to indicate the relative movements thereof; emu-ed eatensions guided in the guides on each of r legs and each having a conflict point; and means for fastening said extensions in ad j usted positions.

5. The combination of a supporting plate; a caliper leg mounted thereon; means for adjusting said leg sngularly with reference to said plate; a secondcaliper-leg pivote gular movement relatively thereto; a mu plying indicating device connected with said plate and said second leg and adapted to indicate the relative movements thereof; longitudinally adjustable extensions mounted on said legs, the legs and extensions having suitable markings, to indicate proper ad- 8% 7 just-ments of SillClBXlQHSlOIlS to compensate for different angular adjustments of sa d second caliper-leg; and means for fasten ing said extensions in their acjusted post tio-ns.

6. The combination of a supportingplate; a caliper-leg adjustably mounted thereon the plate and said leg being provided with a set of markings to indicate the angular relation of said plate and leg;'inean for 99 fastening said leg and plate in their adj ed positions; a second-caliper-leg pivoted to said plate; an indicating device connected with said plate and second leg and adapted to indicate the relative angular movements 35 thereof; extensions mounted on said legs and capable of longitudinal adjustment thereon, the extensions and legs being provided with a second set of markings corresponding to the first mentioned set of markings and 00 adapted to indicate the correct adjustment of the extensions foleach angular adjustment of the plate and first leg; and means for fastening the extensions in their ad justed positions. v

in testimony whereof I have signed my name to this specification in the presnce of two'subscribin r witnesses.

We L'IElt J. MUNGASTER. Witnesses:

G. J. SPEAK;-

J. F srann denies of this patent may be obtained for five cents each, by addressing the 'lioniniissioner o1" lrstents,

Washington, D. G. 

